leo/compiler/tests/function/value_unchanged.leo
2021-03-19 11:30:24 -04:00

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// Functions input in leo are pass-by-value.
//
// Program execution:
// line 15: variable `a` is defined with value `1`.
// line 16: value `1` is copied and passed into function `bad_mutate()`.
// line 10: variable `x` is defined with value `1`.
// line 11: variable `x` is set to value `0`.
// line 18: program returns the value of `a`.
function bad_mutate(x: u32) {
x = 0; // <- does not change `a`
}
function main() {
const a = 1u32;
bad_mutate(a);
console.assert(a == 1u32); // <- value `a` is still `1u32`
}